Page 11 - Clinical Application of Mechanical Ventilation

Contents IX

Chapter 3: ClassifiCation of MeChaniCal Ventilators

Introduction 51
Ventilator Classification 52
Ventilatory Work 52
Input Power 53
Drive Mechanism 53
Piston Drive Mechanism 54
Bellows Drive Mechanism 55
Microprocessor-Controlled Pneumatic Drive Mechanism 55
Control Circuit 56
Mechanical 56
Pneumatic 56
Fluidics 56
Electronic 57
Control Variables 57
Pressure Controller 57
Volume Controller 59
Flow Controller 59
Time Controller 59
Phase Variables 60
Trigger Variable 60
Limit Variable 61
Cycle Variable 62
Baseline Variable 62
Conditional Variable 63
Terminology of Ventilation Modes 66
Volume-Controlled Ventilation 66
Pressure-Controlled Ventilation 66
Intermittent Mandatory Ventilation (IMV) 67
Pressure Support 67
Dual Control within a Breath 68
Dual Control Breath-to-Breath 68
Pressure-Limited Time-Cycled Breaths 68
Pressure-Limited Flow-Cycled Breaths 68
Automode 69
Proportional Assist Ventilation 69
Automatic Tube Compensation 69
Airway Pressure Release Ventilation 70
Output Waveforms 70
Pressure Waveforms 72
Volume Waveforms 73
Flow Waveforms 74
Alarm Systems 75
Input Power Alarms 75

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